Water heating attachment for boilers



Jan. 31, 1933. w. R. SMITH 1,895,868

WA TER HEATING ATTACHMENT FOR BOILERS Filed June 30, 1951 'IQD PatentedJan. 31, 1933 UNITED, STATES,

WILLIAM B. smart, or CHICAGO, ILLINOIS a warm nnermen'rrncnmn F B LE mu's filed rune 30,

' My invention relates to a water heating attachment or equipment forinstallation particularly in steamboiler structures for the heating ofwater" in a water supply systein before reaching the points of co'nsumption. An important object of the invention is to provide awater heatingloop for installation in'a boiler structure in which water flowingtherethrough is heated partially by the hot water or-steam-in the boilerand partiallydirectly b the heat or products of combustion in the fi i'ebox for theboilerstructure. ';A further object is to providean'arrangement' in which two of the'-'boiler tubes,'or tubessubstitutedtherefor are included in the water heating loop for exposure 'to theheat of the water or steam in the boiler, and a header connecting thefront ends of these tubes and extending through the fire box for directexposure to the fire and heat is alsoinclude'd'. A'still further objectisto provide'a water heating loop whose side sections extend through theboiler to be supported by the '25 tube sheets of the boiler and whosefront ends are connected by a head 7 of extended volume and heating[surface for 'exposure directly tothe fire in the firebox so that waterflowing through the loop is partially heat- I 30 ed directlyyby-the"fire and partially bythe waterin the boiler, with the loop deliveringheat to the boilerwhen the temperature of the water therein is higherthan the temperature of the boiler water;

: IA further, object is toprovide a structure which can be easilyand'readily installed, which comprises simple and inexpensive parts, andwhich will rapidly andefiiciently heat and maintain the water at therequired 8 40 t mperature for distribution through the hot water supplysystem. 7 g

The above andother features of the inven- 'tionwill be apparent from thestructure and arrangement disclosed on the drawing, ;in which I IFigure' l is a side elevation, partly ver tical' longitudinal section,of a boiler 'structure and my water heatingattachment'ap plied'thereto;I p

" Figure 2'is asection of the boiler housing 1931. Serial No.547,924. i

on planeIIII of Figure 1, with theboilei partly in section and thein'plan' eleyation; and. i 1 r r'Figure Zia shows a flue iiilongitudinal section'and onfe leg of a water loop therein.

The boiler structure shownis of the well 1 known Kewanee type comprisingthe horizontal-tubular boiler body 10 between whose front and rear itubesheets 11 and 12 extend the flues 13. The boiler is set on brick struc:ture 14 nd at the front thereof isthefire or combustion box 15 overthegratestructure'16; Above the flues thewall 17extends forwardly fromthefront-crbwnsheet 1'1 to formjthe .upper wall of the firebox andconnectswith the frontwall1-8 ofthe fire box into "which fuel is.fedthrough the door-j way 19. The upper space 20 of the-boiler waterheating loop above-the 'fiues extends forwardly to comsurrounding thefirebox. a

The water heatingloop' comprises a head structure 22,;sideconductors 23and-24 and the leads 25 and26 for connecting the loop serially thewater-supply system usually extending from awwater main: to thedifferent points ofhot'water consumption. My improved arrangement issuch-thatthe side members or conductorsi23- and 24 extend through theboiler for-exposure tothe-water therein while the head'22 'iswithin the"fire box for direct exposure tothefire and heat therein; I may use twoof'the-boiler flues for inclusion :in the water'heating loop butpreferably I substitute other tubes for such inunieate withthe waterjacket or legs 21 flues with the tubes, extending sufliciently' beyondthe outer sides ofthe boiler tube sheets for "application thereto ofsuitable fittings for "securing thereto the head 22 and the leads 25 and26. The'locationof the "tubes 23 and24= may be 'atdesire'd points in theboiler but a preferred construction is to utilize the spaces ordinarilyoccupied by the upper and side fiues'for the boiler. When a boileri'smanufactured for use therein of my water heating attachment, the pipes22 and 24 are inserted and secured. to the crown sheets intheordinarymanner, as forexample, by welding or brazing. Whenthe loop isto be installed in a boiler structure vnected with the other endsof-the' pipes which is already in use, two of'the flues are removed andthe looppipes 23 and 24 substituted therefor and secured in place. Theouter ends of the pipes are preferably threaded for'receiving suitablejoint or cou pling members. I have shown a head 22 of substantially. Ushape whose ends 27 v and .28

are securedto, theends of the pipes. 23a-and 24 by coupling or ointmembers 29 and 30,

and the distributing leads 25 and 26 are concoupling or jointmeinbers 31and 32.

' 7 Where the pipes 23 and 24 are located in the upper and side flueholes, the head struc-, ture 22 will project into the fire box near thetop thereof and the' shape and extent of the'head will depend upOnthedegree 'and rapidity of heating desired or upon the proportionate directfiretheatingofithe water to the heating ofthe water in the loop by thewater'or steam inthe boiler; Ihave shown the head 22 laterallyexpandedso as to spread the water-flowing therethrough alongithe ex tended areaof the headerwhich will be *ex posed to the flame and heat'i-n the firebox,

The header may be in the form of'a casting or may be. constructed ofsuitable sheet, metalparts welded or otherwise secured to gether.Instead of the speciallshaped head+ er, a length of pipe or a coil ofpiping could be extended between the ends. of thetubes 23 and .24 fordirectfexposure to the "heat inthe firebox. d Y

\5 Where the flues of a boiler are of comparatively large diameter,flues need not be removed for the installation of the hot water loop,but as shown in Figure 3 theside legs 33 of the loop could be extendedthrough the desired flues. The pipes could also be of a length so thatthe joints or connection thereof with the leads and 26 would be outsideof the furnace or'boiler structure walls. The

7 side pipes for the loops could then be inserted from the rear endofrthe boiler structure through the desired fines and the-header 22 andthe-leads then connected with the respective' ends-ofthe pipes. V gIthu'si-providea water heating attachment or loop structure comprising aminimum .number of simple, inexpensive parts easily and readilyassembled and installed in conrnectionfwithj'th'e boiler for the heatingof the water flowing therethrough partly by the direct heat of thefirebox and partly by the water or steam in the boiler. Where the header22 is of extended-exposure surface for rapid heating directly by thefire, the

heated water in the loop may assist in heat- :ing theboiler water duringperiods when hot water is not being drawn-in great quantities 'fromthehot water supply circuit. At other times the extendedheader 22 willmaintain maxi mum thewater at the proper temperaturefor supply of hotwater to the hot water circuit.

' rear ends of saidipipesbeing adapted to, eonends-thereof, two of saidfluesforming. the

By utilizing the upper flues or flue passages for application of thewater heating loop, the header 22 will be near the top of the fire boxso that it will not interfere with proper firing or combustionconditions.

7 I have shown a practical and efficient embodiment of the features,of;.1ny.- invention,

butIdo notdesire to be limited. toithe'} exact construction andarrangement disclosed and described as changes and modifications may bemade' without departing from the scope and spirit of the invention asdefined in the ing of the watervby the fire, ".2.- The combination withaboilenand-a fire "box therefor ofia water heatingloopeom prising pipesextending through the boiler and the tubeijsheets thereof,Taiheaderstruc ture connectedfwith the frontgends t the pipes to bedisposedJentirely.withini-the fire box and extending horizontallyjthereacrosS adjacent the top of. ;the fire box for; direct heating of;the water therein by the fire, the

heat the loop in a hot water supply-system 3- The combination withaboiler, having flues extending therethrough and ga fireboxcommunicating-with said flues at thegf-ront sides vof a waterheatingloop, a headereonnecting the front ends of said two flues to completethe loop, said header being entirely within the fire box (for directheating-by the fire and said two. flues being heated boiler water, saidheader'comprising-a .rela' tively- 1 large flat hollow -flui'd containerex:- tending horizontally acrossthe fire box ad: j acent the topthereof, the reariends offlsaid two *flues being adapted' toriwnnectionwith @1 a hot water: supply lineriorfinclusion of the loop therein.

' v 4. The combination boilerandia box therefor, of a water =heating .Uloop havi gits legs extending through the boilerand its bend entirelywithin the firebox and'extending horizontally'thereacross adj acent, thetop of the firebox whereby 'Wateruflowing through the loop'will bepartly directly heated by the fire and partly by th 'wat fifih 125boiler; heloop-at its endsbeing adapted' for connection for inclusion ina hot water; sup- .plyzsystem." Y

5. The combination aaatgit ftaag flues therethroughand a fireboxeomgxgni- M0 as r by he J30 eating with the fines, the upper side fluesforming side legs of a water heating loop, a connection between thefront ends of said two flues completing the loop and being disposedentirely in the fire box and extending horizontally thereacross adjacentthe top of the firebox, and exposed to direct heating by the fire, therear ends of said two flues being adapted for connection with a watersupply circuit to include said loops therein.

6. The combination with a boiler having fiues and a fire boxcommunicating therewith, of a water heating coil comprising pipesextending through some of said boiler flues, a header connecting thefront ends of said pipes and located entirely within the firebox to beexposed to the direct heat ofthe fire, said header comprising arelatively large flat hollow fluid container extending horizontallyacross the fire box adi acent the top thereof, the rear ends of saidpipes being adapted for connection with a hot watersupply circuit forinclusion of said coil therein. In testimony whereof I have hereuntosubscribed my name at Chicago, Cook'County,

WILLIAM B. SMITH.

Illinois.

